TM-9-2320-342-10-1
TRUCK, WRECKER, 8X8 M984A4
TECHNICAL MANUAL; OPERATOR'S MANUAL
OCTOBER 2008
TM-9-2320-342-10-1 - Page 185 of 1428
AUTOMATIC TRANSMISSION - Continued
Allison
TRAILER
AIR SUPPLY
M
M
TURBINE SPEED
SENSOR
TCM
OUTPUT
SPEED
SENSOR
ENGINE SPEED
SENSOR
CONTROL VALVE
MODULE
1
2
Figure 2.
The TCM also protects the transmission from cold weather startups by inhibiting normal
shifting functions until a minimum sump temperature of 20°F (-7°C) is attained.
A check transmission indicator (2) located on the instrument panel alerts the operator,
momentarily, every time the system is activated as a lamp check, and when the TCM finds
a problem in the system.
TM 9-2320-342-10-1
0012
0012-3
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